JP2009518797A5 - - Google Patents

Description

The present invention relates to transparent or translucent glass-ceramic plates (these terms also include, for example, plates known as translucent plates which are mostly colored), and transparent or translucent glass-ceramic plates are particularly Intended to cover or receive the heating element, in particular intended to serve as a de plaque de cuisson, the heating element associated with this hob being for example for induction heating Heat source, radiant heat source, halogen heat source, etc.

The novel plate according to the invention is a transparent or translucent glass ceramic plate, for example intended to cover or receive at least one heating element, in particular a hob (top of the range, de plaque). de cuisson), the plate has a coating and is intended to at least partially hide the underlying elements, especially when not activated, The inside is intended to be able to detect heating elements or indications as desired, and most of the coating (more than 50%, preferably more than 75% and particularly preferably more than 90%) and preferably all (exclusively), it is characterized in that on the surface of the plate intended to be directed towards the heating element in the use position (usually referred to as the lower surface or inside surface The surface).

The manufacture of the plate is simplified by the fact that the coating of the plate is deposited only on one side, so that when the plate is used, the coating becomes visible through the plate, which Deposition and subsequent handling of the plate results in requiring fewer precautions than if it is necessary to have a coating on both sides. Furthermore, the coating to such upper surface, is likely to cause contamination and embrittlement, friction, complicates the maintenance of the surface undergoing contamination.

In a particularly preferred method, said coating has a region or regions group known as the background, it accounts for most of the surface of the coating (usually 50% to 9 9%), also are preferably plate It is intended to hide the main part of the heating structure to be covered and has a region or group of regions referred to as the display region (usually corresponding to 1% to 50% of the coated surface), Allows to display the position of patterns and / or signs (trademarks, design letters, symbols, etc.) and / or functional elements (eg heating elements, control devices, displays, etc.) with respect to the background, Detecting whether these elements are active, the background area and the display area are identified by their color or color intensity and / or their pattern, and the distinction between the various areas is a distinct line or color Properly allows it to be carried out by a region having a gradual change in the pattern.

Glass ceramic or naked substrate underlying forming the plate (before the addition of the coating) is preferably transparent or translucent, as indicated above, also usually more than 50%, especially 50% Light transmittance T _{L in} the range of ˜90% (integrated in the range of 0.38 μm to 0.78 μm in the visible wavelength range by the light source D ₆₅ ). The coating (and the layer forming the coating as will be explained below) is preferably a plate with a coating according to the invention with a very low light transmission (especially less than 5% or 10%, or with respect to its background area, or The area itself, known as the display area, has a light transmittance of, for example, less than 20% (especially in the range of 0.2% to 20%), in particular less than 10% (especially 0. 0%). Selected in the range of 5% to 10%).

Background area and the display area, in particular each, at least one layer of paint, or at least one thin layer, or layers comprising effect pigments (des pigments a effet), or it is formed by such enamel (email) layer Well , usually and advantageously, it is opaque or reflective (and / or translucent or semi-reflective as desired) depending on the area. All of the various areas of the coating are preferably formed from a paint and a thin layer or only from a layer of paint. Various covering region, different coating and / or have the same principal component, different pigments or paints and / or different pigment concentration coating comprising a pigment mixture, and / or other paint that is coated with different thicknesses And / or the fact that paints applied in different numbers of layers were used.

The coating can include areas with a mesh or speckled or speckled screen or pattern. In that way, aesthetic light dispersion and scattering effects can be created during use of the plate.

For example, the paint can be a paint based on at least one silicone resin, in particular a silicone modified by incorporating at least one group, such as an alkyd group, a phenyl group or a methyl group. It can be a paint based on resin. Further, it is possible to add a pigment as a colorant, for example, a pigment for enamel (for example, selected from components including metal oxides such as chromium oxide, copper oxide, iron oxide, cobalt oxide, nickel oxide, Or selected from copper chromate and cobalt chromate), TiO ₂ , and the like. It is also possible to use as particles the particles of one or more metals, such as aluminum, copper, iron or the like, or alloys based on at least one of these metals.

The following resins used alone or as a mixture, without limiting implications, can be said to be perfectly suitable. Dow Corning® 804, 805, 806, 808, 840, 249 , 409HS and 418HS, Rhodia's RHODORSIL® 6405 and 6406, General Electric Silicone's TRIPLUS (Registered trademark) and SILRES (registered trademark) 604 of Wacker Chemie GmbH.

Preferably, at least one layer of paint is chosen, in which the resin is at least partly or fully cross-linked and / or pyrolyzed and / or not heat-treated (the resin is The coating layer can be partially or completely a) an inorganic filler and b) at least one crosslinkable. a carbon-based material of the polysiloxane resin (almost) precursor and / or at least one crosslinked polysiloxane resin and / or porous free of carbon-based material or a carbon-based substance prior precursor does not contain, It consists of a mixture of silica-based inorganic matrix (substantially) free of carbon-based materials (the resin is, for example, pyrolyzed and thus mineralized) N wood is dispersed in a resin or matrix.

In another embodiment of the present invention, the layer (particularly a semi-reflective layer) includes an effect pigment (a metal effect pigment, an interference pigment, a pearl pigment, etc.) dissolved in an appropriate medium as necessary. A layer can be used and this layer usually has a sparkling or sequined effect. This layer preferably comprises an oxide selected from molten silicates, glass frits or glass fondants (a vitrifiable mixture, usually used in particular for enamel frits, for example silicon. Zinc, sodium, boron, lithium, potassium, calcium, aluminum, magnesium, barium, strontium, antimony, titanium and zirconia oxides), and the effect pigments used are preferably coated with metal oxides It was in the form of aluminum oxide _(Al 2 _{O 3)} flakes, for example, Merck the trademark Shirarikku (Xirallic) pigments sold (R), for example _TiO 2 / _Al 2 _{O 3} pigments or interference pigments (Shirarikku (XIRALLIC) (registered trademark) T-50-10SW Chris Le Silver or Shirarikku (Xirallic) (registered trademark) T-60-23SW Galaxy Blue or Shirarikku (Xirallic) (registered trademark) T-60-24SW Stellar Green), or _{Fe 2 O 3 / Al 2 O} 3 pigment (Shirirakku ( XIRALLIC) (registered trademark) T-60-50SW fire side copper or XIRALLIC (registered trademark) F-60-51 radiant red).

Other effect pigments that can be used are, for example, combinations of oxides or oxide _(e.g., selected from such as _{TiO 2, Fe 2 O 3,} Cr 2 O 3) based on a mica powder coated with Pearl pigments , such as those sold by Merck under the trademark IRIODIN®, or silica platelets coated with oxides or combinations of oxides (similar to those described above), such as Examples include those sold under the trademark COLORSTREAM (registered trademark) by Merck. Fillers and other conventional color pigments can also be incorporated into the effect pigments. The content of the effect pigment can be, for example, about 1% to 30% by weight relative to the main component in which it is incorporated (molten silicate, glass frit or glass flux). The layer is particularly screen printed (the main component and content are optionally suspended in a suitable medium, and the medium is usually intended to disappear during the subsequent curing step, which medium is especially a solvent. The thickness of the layer is, for example, from about 1 μm to 6 μm.

The plate according to the invention is practical for use and easy to clean. Be positioned across the coating on the lower surface, if necessary, unattractive optical effects, for example, make it possible to avoid the double image, and at the same time, the exposed face of the plate in the position of use (user The problem of wear of the coating during the cleaning of the outer or upper surface (toward) can be avoided.

The glass ceramic plate is usually manufactured as follows. A glass having a composition selected for the formation of a glass ceramic is melted in a melting furnace, and the molten glass is then passed through a rotating roll of standard glass or in a roll. Sheet and cut glass string to desired dimensions. The plate thus cut is then ceramized in a manner known per se, the ceramization being the thermal chosen to convert the glass into a polycrystalline material called “glass ceramic”. Consists of firing the plate in profile, the glass ceramic has a coefficient of expansion of 0 or nearly 0, and in some cases is resistant to thermal shock in the range up to 550 ° C. and preferably in the range up to 700 ° C. There is. Ceramming usually involves gradually raising the temperature to a nucleation range generally located in the vicinity of the glass conversion range, passing through the nucleation range for several minutes , and then gradually raising the temperature to the ceramicization holding temperature. The ceramization holding temperature is maintained for a few minutes and then rapidly cooled to room temperature.

In FIG. 2, a part of another glass ceramic plate 1 ′ according to the present invention shows a pattern 5 of the background, mesh or spotted type, and the connecting region 6 is one of the display regions. It is represented by alternating, shaded points, with dark colored regions 7 intended to be part.

Therefore, it can be seen that it is possible to obtain plates with extremely various screen patterns, in particular, patterns having a light scattering effect, such as meshes, spots, and spots. Light distribution and scattering of light is generated by the lower plate, the most by attractive have the effect (Mitsui) and decorators and designers, best seen in the lighting element in the heating element and under all kinds Can be chosen as fit.

Claims (9)

A transparent or translucent glass ceramic plate, for example intended to cover or receive at least one heating element, in particular intended to serve as a hob or range top surface, the plate being coated Intended to at least partially hide the underlying element when not in operation, while being able to detect heating elements and desired indications during operation and have at least 90% of the coating, Ri surface on the near the intended plate to be directed toward the display by heating elements and optionally in the use position, and the coating is a region or area known as a background Has a group, which occupies most of the surface of the coating and is preferably intended to hide the main part of the heating structure that the plate should cover And has an area or group of areas called display areas, which makes it possible to display the position of patterns and / or markings and / or functional elements with respect to the background, On the other hand, it also detects whether these elements are active, the background and display areas are identified by their color or color intensity and / or their pattern, and the distinction between the various areas is a clear line or capable glass-ceramic plate, wherein to Rukoto to be performed by a region having a gradual change in color or pattern.   2. The glass ceramic plate according to claim 1, wherein the coating is applied to the entire surface of the plate. Background area and a display area, each of the at least one layer or at least one lamina or claim 1 or 2 glass-ceramic plate according to, characterized in that it is formed by a layer or enamel layer containing the effect pigments of the paint.   4. A glass-ceramic plate according to claim 3, characterized in that all the various areas of the coating are formed from paint layers and thin layers, preferably from paint layers. Various covering region, different coating and / or have the same principal component, paint in the paint and / or a different pigment concentration of different pigment or pigment mixtures, and / or further coating paint in different thicknesses, and / or a different number of layers in the coating glass ceramic plate according to any one of claims 3-4 in which the paint is characterized by the Turkey be distinguished by the fact that it was used. The glass ceramic plate according to any one of claims 3 to 5 , wherein the coating includes a mesh or a region having a speckled or speckled screen or pattern. All Most preferably the coating is any one of claims 1 to 6, characterized in that it is applied on the surface of the bare glass-ceramic plate intended to face the heating element in use position The manufacturing method of the plate of description. At least a first layer intended to form at least a first region is applied, and one or more resists are provided or made therein, the resist comprising the first region 8. A method according to claim 7 , characterized in that it is covered by at least one second layer intended to form at least a second region. A high temperature maintenance or cooking apparatus, the hot maintained or cooking apparatus including one glass-ceramic plate of one of claims, also one or more heating elements, in particular induction heating element of claim 1-6.